Sliding-door lock



(No Model.) r.

` J. A. LOEWER 8u J. G. SIEBER.

SLIDING DOOR LOCK.

Patented oct. 23,1894.

No.v 527,797.

UNITED STATES lPATENT ENCE.

JOHN A. LOEWER AND JOHN' G. SIEBER, OF BUFFALO, NEW YORK.

'sLlDlNG-DooRLooK.

SPECIFICATION forming part of Letters Patent No. 527,797, dated October 23, 1894.

Application led December 1., 1 893.

.To @ZZ whom, t may concern.-

Be it known that we, JOHN A. LOEWER and JOHN G. SIEBER, citizens of the United States, residing at Bualo, in the county of Erie and State of New York, have invented certain new and useful Improvements in Locks; and we do hereby declare the following to be a full,'clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to gures of reference marked thereon, which form a part of this specification.

Our invention relates to an improved form of lock more particularly adapted' for use upon doors in 'the framework surrounding elevator shafts.

The object of our invention is to so arrange the latch plate that the latch proper can be secured against displacement in its two extreme positions, either when down in locked l position or when up in unlocked position.

To that end our invention consists of a pivoted' latch plate provided at its free end with an engaging projection or latch and at its piv` oted end with a spur above the pivot-point and a notch below the pivot-point for engagement. with the key and a pivoted springpressed locking-plate with inclined lower edge for engagement with the key and an opening in the plate having two upwardly extending seats for alternate locking engagement with the spur upon the latch plate.

We will now proceed to minutely describe the manner in which we have carried out our invention and then claim what we believe to be novel.

In the drawings, Figure 1 is a side elevation of ourl improved lock showing the latch in locked engagement. Fig. 2 is a similar view showing the latch in locked disengagement. Fig. 3 is a detached side view of the latch-plate, andv Fig. 4 is a similar View of the locking-plate.

Referring to the drawings, lis the sidepiece of the elevator or other door having the latch-slot 2, and 3 is the side-piece of the frame worksurrounding the opening for the door and having the latch-slot 4 which registers with the latch-slot 2 of the door when in closed position as shown in Figs. 1 and 2.

A casing 5 is secured to the side-piece 1 Serial No. 492,408. (No model.)

around the latch-slot 2 and contains the operative parts of the lock of which 6 is the latch-plate provided at its free end with the engaging projection or latch 7 and pivoted l at 8in the casing 5. Above its pivot-point 8 is secured the spur 9 and below the pivotpoint 8 is the angular notch 10 cut in its edge for engagement with the key.

1l is the locking-plate pivoted at 'l2 in the front side of the casing 5.

A fiat spring 13 has one end secured in a slot 14 cut in the plate ll upon its under side. This' spring is bent around the pivot end of the plate and its free end is bent down so as to rest under the pin l5 secured in the casing.

The action of spring 13 secured in this manner has'a tendency lto exert at all times a downward pressure of the locking-plate 1l upon its pivot-point 12. This locking-plate has upon its under side the inclined edge 16 for engagement with the key as it turns and 17 is an opening in the free end of the locking plate provided with the two upwardly extending seats 18 and 19 with which the spur 9 upon the latch-plate 6 alternately engages.

Fig. l shows the door locked. To unlock the same the key 'is placed in position and turned in negative "rotation or from right to left. As the Wing of the key strikes the outer end of the inclined edge 16 of the. locking plate 1l it raises it against the action of its spring 13 until its seat 18 is thrown out of engagement with the spur 9 upon the latch plate sfo that when the wing of the key engages vin the notch 10 of the latch-plate, such plate is free to be swung upwardly upon its pivot until the latch 7 is out of engagement with the latch-slot 4. In the 'meantime the spur 9 upon the latch-plate 6 has passed into position to engage with the seat 19 in the locking-plate 11 and as the pressure of the revolving key-wing is released from the inclined edge 16 the spring 13 throws down the locking-plate and holds the seat 19 in engagement with the spur 9 as shown in Fig. 2 in which position the latch-plate 6 is locked in unlatched position.

To lock vthe latch-plate in latched position as shown in Fig. 1, it is only necessary to turn IOO the key in positive rotation or from left to right and a reversal of the former operation just described is effected, the spur 9 being in the plate having two upwardly extending seats for alternate locking engagement with the spur upon the latch-plate all combined and opelatin g substa'n tially es shown and described. In testimony whereof We have signed our names tol this specification inthe presence of 2o two subscribing witnesses.

JOHN A. LOEWER. JOHN G. SIEBER.

' lVitnesses:

W. T. MILLER, O. E. HODDICK. 

